Study on the micro-region structure and properties of two dithienothiophene-dicarboxylic acids  

作　　者：WANG DeKun JIANG XiaoHong ZHAO ChunMei WANG ZhiHua WANG Hua DU Zu Liang 

机构地区：[1]Key Laboratory of Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, China

出　　处：《Chinese Science Bulletin》2010年第6期478-483,共6页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.20672028,10874040,20803018);Program for New Century Excellent Talent in University (Grant Nos.NCET-04-0653,NCET-05-0610);Cultivation Fund of Key Scientific and Technical Innovation Project,Ministry of Education of China (Grant No.708062)

摘　　要：Self-organized dithieno [3,2-b:2',3'-d] thiophene-2,5-dicarboxylic acid (A) and dithieno [2,3-b:3',2'-d] thiophene-2,5-dicarboxylic acid (B) films were prepared through solvent-induced order-disorder transition method.The arrangement of the two molecules on substrates were observed by atomic force microscopy (AFM),which demonstrated that A was arranged orderly in a certain angle on mica,while B was flat-flying on mica.The optical and conductance properties in micro region of these two compound films were characterized by UV-vis absorption spectroscopy,fluorescence spectroscopy and conductive atomic force microscopy (C-AFM).The results revealed that the fluorescence and absorption peaks of A had a large red shift in comparison with those of B.The conductance of the J-aggregates for A is three orders magnitude higher than that of B.It is concluded that the large conductance difference mainly comes from different aggregation structures and orientations of these two molecules on substrate.Self-organized dithieno [3,2-b：2′,3′-d] thiophene-2,5-dicarboxylic acid （A） and dithieno [2,3-b：3′,2′-d] thiophene-2,5- dicarboxylic acid （B） films were prepared through solvent-induced order-disorder transition method. The arrangement of the two molecules on substrates were observed by atomic force microscopy （AFM）, which demonstrated that A was arranged orderly in a certain angle on mica, while B was fiat-flying on mica. The optical and conductance properties in micro region of these two compound films were characterized by UV-vis absorption spectroscopy, fluorescence spectroscopy and conductive atomic force microscopy （C-AFM）. The results revealed that the fluorescence and absorption peaks of A had a large red shift in comparison with those orB. The conductance of the J-aggregates for A is three orders magnitude higher than that of B. It is concluded that the large conductance difference mainly comes from different aggregation structures and orientations of these two molecules on substrate.

关 键 词：微区结构 导电原子力显微镜 酸性质 紫外可见吸收光谱 二元 电导性能 荧光光谱 分子取向 

分 类 号：O643.36[理学—物理化学] TQ317[理学—化学]